[derefr]

Because you don't always have to use it like a laptop; most of the time you're not editing, so most of the time you're not using the keyboard.

This is the same as, say, people who prefer to use laptops docked to a large screen with an external keyboard and mouse. Most of the time, they can get away without needing all that, which is why they have a laptop instead of a desktop PC plugged into the same peripherals. But sometimes, for an especially heavy-duty task, it's good to be able to temporarily assume the next form-factor up.

[cm2187]

Yes but then you have your fingers on a keyboard when you revert to tablet mode. Unless they leave the keyboard in a suitcase.

[derefr]

Right, that's what I meant. You set aside time as "productivity time" where you get the keyboard out of your bag; once you're done, you pack it away.

Works well for me (fiction writer), but might not work for people whose workflows involve constant distraction.